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WILLIAM H. GUIGNON AND lWILLIAM D. MCDONAIVJD, OF WARREN, PENNSYLVANIA.

Letters Patent No. 71,883, dated November 26, 1867.

IMPROVEMENTINKILNS FOR GHARRING WO0D`,1&c. i

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TO ALL WHOM IT MAY GONCERN:

Be` it known that we,.W. H. GUIGNON and W. D. McDoNALD, 'of Warren, in the county of Warren, and

l State of `Pennsylvanie.,,have invented a new `and useful Improvement in Kilns; and we do hereby` declare 'thut 4 the following is a. full, clear, and exact description thereof, which will enable those skilled in the nrt to mnke and use the same, reference being had to tho accompanying drawings, forming part of this speciiication.

This invention relates to a. new und improved method of constructing kilns forcharring and carbonizing wood for charcoal, and for making coke, and other purposes; and the invention consists in making'the kilns selfeacting and portable, as will be hereinafter more fully described. The drawing p p i Figure 1, represents a sectional elevation of the kiln, showing the manner in which it is coistructed, the section being through the line a: of iig. 2.

Figure 2 is a top or plan view of the kiln.

Similar letters of reference indicatecorres'ponding parte. V

The kiln is formed of an outer and an inner shell, and a conical capfor cover, whichis detachable. The

space between the outer and inner shell is filled with some good non-conducting substance, so as to prevent the' radiation of heat from the kiln.

A is the outer shell, and B is the inner shell. C represents the filling between the two. Dis the cover. s

E represents the substance which is to be charred or cnrbonized. F is the valve-rod, with a cupfvalvo, F',`on its upper end, which closes over a tube, Gr, the top rim of which forms thc valve-seat. This tube `Gr is placed attho` apex of` the conc-shaped cover, and the gases evolved by thc process may escape through it. This tubular valvei seat is surrounded by a pipe or chimney, I, and the space around the scat maybe filled with sand. On'tlireflower p end of the valve-rod there is a disk of met-al, H, which, during the process of burning, rests on thas-contents of the kiln.

It will be seen thnt7 as the process proceeds, the contents will settle, and theadjustment is such` thnt,.w hen the process has been carried far enough, and the wood or other substance has becnusuieiently burned or charred,

the disk 'will not be supported by the substance or contents of the kiln, but th valvcwill descend and close the p.

tube, and therebyprevent'further combustion. Thusthe kiln is made to operate autometically. N

J represents tubular apertures through thc kiln, which may bc closed by suitableplugs, when necessary.`

0n 'the top Dthere are windows lor lapertures, K, which are closed by slidingynlves oridobrs, as seen Vin the i drawing. p p Portions of the b'ody of the kiln are madc'detachable, for thc purpose of allowing thecontonts ofthekiln to be removed.

The material to be charred or carbonizcd is put in the kiln from `the tgp, which rests on the' innerfsliellhnd i is removable therefrom.

The outer and inner shell, as welles the top of this kiln, are made of iron or other suitable xnatc1inl,":nn1

the kilns may be made ofnny desired size', so that they are portable when soldcsired.

Having thus described our invention, wc claim as new, and desire to secure by Letters Patent-f,

1. A kiln, for charring or carbonizing wood or coal, which is self-acting or automatic in itsoperation, sub- 1 stantially as described.

2. A portable kiln, for carbonizing wood or'coal, which is formed of a double `wall, or nu outer and :in inner shell, whereby the heat is confined in the kiln, substantially as shown and described.

i WILIIAM" H. GUIGNON,

'WILLIAM D." McDONALlli i Witnesses:

W. J. CLEMoNs, .TAsL GUIGNON 

